Question:What does static variable mean? 

Answer There are 3 main uses for the static.

1. If you declare within a function: It retains the value between function calls

2. If it is declared for a function name: By default function is extern..so it will be visible from other files if the function declaration is as static..it is invisible for the outer files 

3. Static for global variables: By default we can use the global variables from outside files If it is static global..that variable is limited to with in the file.
#include <stdio.h>
int t = 10;  
main(){
int x = 0; 
void funct1();
funct1();            
printf("After first call \n");
funct1();            
printf("After second call \n");
funct1();            
printf("After third call \n");
}
void funct1()
{
    static int y = 0;  
    int z = 10;             
    printf("value of y %d z %d",y,z);
    y=y+10;
}
value of y 0 z 10 After first call
value of y 10 z 10 After second call
value of y 20 z 10 After third call 

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